code: def _state_preparation_pauli_words(num_wires):
      """Pauli words necessary for a state preparation.
  
      Args:
          num_wires (int): Number of wires of the state preparation
  
      Returns:
          List[str]: List of all necessary Pauli words for the state preparation
      """
      if num_wires == 1:
          return ["X", "Y"]
  
      sub_pauli_words = _state_preparation_pauli_words(num_wires - 1)
      sub_id = "I" * (num_wires - 1)
  
      single_qubit_words = ["X" + sub_id, "Y" + sub_id]
      multi_qubit_words = list(
          map(lambda word: "I" + word, sub_pauli_words)
      ) + list(map(lambda word: "X" + word, sub_pauli_words))
  
      return single_qubit_words + multi_qubit_words
  
file_path: pennylane/pennylane/templates/state_preparations/arbitrary_state_preparation.py
imports: import functools
  import pennylane
  from pennylane.operation import Operation, AnyWires
label_desc: Use image node_id 1 for calling a global function with example usage: _state_preparation_pauli_words(num_wires) and returns: unknown, list